/Engine/Source/Runtime/MeshDescription/Public/MeshDescription.h
Return adjacent polygons into aTArraywith the specified allocator
template<typename Alloc> [TArray](API\Runtime\Core\Containers\TArray)< [FPolygonID](API\Runtime\MeshDescription\FPolygonID), Alloc > GetPolygonAdjacentPolygons ( const [FPolygonID](API\Runtime\MeshDescription\FPolygonID) PolygonID ) const